scripts: install and run pyupgrade (#31587)

old-commit-hash: 30afe2c231

scripts/pyupgrade.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+
+pip install --upgrade pyupgrade
+
+git ls-files '*.py' | grep -v 'third_party/' | xargs pyupgrade --py311-plus